[3L10-15] Tritium Engineering

[3L11] Study on T-production Li rod for HTGR

Li rod Structure and Loading Method Considering Reactor Core Heterogeneity

*Yuki Koga¹, Hideaki Matsuura¹, Kazunari Katayama¹, Teppei Otsuka², Minoru Goto³, Shimpei Hamamoto³, Etsuo Ishitsuka³, Shigeaki Nakagawa³, Kenji Tobita⁴, Ryoji Hiwatari⁵ (1. Kyushu Univ., 2. Kinki Univ., 3. JAEA, 4. Tohoku Univ., 5. QST)

Keywords:Fusion reactor, Tritium production, HTGR, Li rod, Reactor core heterogeneity

Tritium is needed as initial fuel for ignition of fusion reactor. The tritium production method by loading Li rod into the HTGR as burnable poison was proposed. In past studies, it has been assumed that all Li rods loaded have same structure despite there are special distributions of reactor composition, temperature and neutron flux. Amount of produced tritium can be optimized by loading Li rods which has different structure considering fuel regions. Furthermore, changing of Li rod structure in each fuel regions is easier and leaked T also decreases by using high concentrated ⁶Li. In this work, the influence of amount of produced T by loading different structure Li rods into the HTTR was evaluated, and its parameter and placement which enable minimize leaked tritium and maximize produced tritium were considered.